Conclusive and Incontestable

Conclusive

Conclusive adjective - Serving to put an end to all debate or questioning.
Usage example: the archeological discovery was conclusive proof that the Vikings had indeed settled in North America around 1000 a.d.

Incontestable is a synonym for conclusive in incontrovertible topic. In some cases you can use "Incontestable" instead an adjective "Conclusive", when it comes to topics like irrefutable.

Incontestable

Incontestable adjective - Not capable of being challenged or proved wrong.
Usage example: the incontestable statement that every contest has a winner and a loser

Conclusive is a synonym for incontestable in certain topic. You can use "Conclusive" instead an adjective "Incontestable", if it concerns topics such as unequivocal, incontrovertible, irrefutable.

Nearby Word: incontestability
Cite this Source
Incontestable and Conclusive. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/conclusive/incontestable
Conclusive & Incontestable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/conclusive/incontestable>.
Incontestable or Conclusive. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/conclusive/incontestable.
Google Ngram Viewer shows how "conclusive" and "incontestable" have occurred on timeline